DS is OT (what's new, eh?!

). He was quite poorly a few weeks ago and hasn't yet got back on track. It's not as bad as it was, but we're getting NTs again

The last few nights he's had NT's but WU has been usual time (6am ish) and BT has been the earliest I could manage (generally 6.15pm ish - although ideally would have been 6pm very latest).
This morning he woke later - 7.15am, but had had a bad night (he does tend to sleep in a bit if he's been up a lot in the night. So what would you have done for BT?
I think he could have done with a nap, but generally when WU is later I struggle to get a nap out of him, and if I do it needs to be later and means BT is a nightmare. Anyhow, he will only nap in the car and DH had that today so a nap wasn't an option in the end anyway.
I generally tend to aim for usual BT (I aim for 11.5hrs from waking) when we get a later WU as even though he was up later it was due to him having a bad night, and I know he's OT, however *usually* he takes a while to go to sleep so I've always thought he was UT at BT because of the later WU and really I should have pushed BT later.
Well, I think I've been getting this all wrong and when we have a later WU due to a bad night he's still OT and actually needs an earlier night despite the later WU

He had an early bath this afternoon (we were bored so spent an hour in the bath playing

) so was ready for bed early, and also had a slightly early dinner, and he seemed 'sleepy' at 4.30/5pm. He then came to life just before he got into bed at 5.30pm

I was really worried then that I'd missed the window and should have put him to bed by 5pm - would you have gone this early?
He actually fell asleep near enough straight away (was asleep by 5.45pm) but we've had NT's already